# for i in range(10):
#     print(i)

# for i in range(5, 10):
#     print(i)

# for i in range(1, 10, 2):
#     print(i)

# for i in range(5, 0, -1):
#     print(i)

sum100 = 0
for i in range(1, 101):
    sum100 += i
print(sum100)
